Hello everyone~

PLZ HELPPPPP MEH-
Could somebody check my answers??
(Excuse some questions missing, I don't have answers to those yet. The questions with "**" besides them means that that is my answer that I choose. Also on certain questions there is multiplication involved so because I don't know how to make the floating multiplication dot, I will be using a capital "X" for the questions that do have that dot. Thank you for taking your time to read this.)

For questions 1-3, simplify the polynomial.

1. 14x^2 + 4 + 3x - 12x^2 - 3 + 11x
A. 2x^2 + 7x + 1
B. 2x^2 + 14x + 1**
C. 2x^2 + 14x + 7
D. 26x^2 + 7x + 7

2. 2x^2 + 8 - 4x + 3x - 6x^2 + 7
A. -8x^2 - 7x + 15
B. -4x^2 - x + 15**
C. 4x^2 + x + 15
D. 8x^2 + 7x + 15

3. 2x^2 + 6x - 7x + 8 - 3x^2 + 1
A. 2x^2 + x + 9
B. -2x^2 - x + 9
C. -x^2 - x + 9**
D. x^2 + 9

4. In the expression -7x - 3x^2 + 5, what is the coefficient of x?
A. 7
B. 3
C. -3
D. -7**

Add or subtract.
5. (m^2 - m - 3) + (m - 4)
A. m^2 + m - 1
B. m^2 + 2m - 7
C. m^2 - 7**
D. m^2 - 1

Add or subtract.
6. (4x^2 - 2x - 1) - (-3x^3 + 2)
A. -3x^3 + 4x^2 - 2x + 1
B. -3x^3 + 4x^2 - 2x - 3
C. 3x^3 + 4x^2 - 2x + 1
D. 3x^3 + 4x^2 - 2x - 3**

7. Suppose you earned 7t - 1 dollars on Monday and 8t + 5 dollars on Tuesday. What were your total earnings? Simplify your answer.
A. -t + 4 dollars
B. -t - 6 dollars
C. 15t - 6 dollars
D. 15t + 4 dollars

8. f^7 X f^1
A. f^8**
B. f^7
C. (2f)^8
D. (2f)^7

9. 100^12 over 100^8
A. 100^12/8
B. 100^96
C. 100^4**
D. 100^20

10. x^13 over x^2
A. x^13/2
B. x^15
C. x^11**
D. x^26

11. 4^4 X 4^10
A. 4^14**
B. 4^6
C. 4^40
D. 4^10

12. 2^2 X 2^22
A. 2^20
B. 2^18
C. 2^44
D. 2^24**

Write the value of the expression.
13. 2^3 over 2^3
A. 0
B. 1**
C. 2
D. 3

14. 2^2 over 2^5
A. 8
B. 6
C. 1/8**
D. -8

Multiply. Write the result in scientific notation.
15. (9 X 10^6)(7 X 10^5)
A. 1.6 X 10^31
B. 1.6 X 10^12
C. 6.3 X 10^31
D. 6.3 X 10^12**

16. (1.1 X 10^-5)(3 X 10^-2)
A. 4.1 X 10^-7
B. 4.1 X 10^10
C. 3.3 X 10^-7**
D. 3.3 X 10^10

Simplify the expression.
17. 8t^5 X 8t^5
A. 64t^25
B. 64t^10**
C. 16t^10
D. 16t^5

18. -3(4x + 5)
A. 7x + 15
B. 7x - 15
C. -12x - 15**
D. -12x + 15

Simplify the expression.
19. 3k^2 (-2k^2 - 4k + 7)
A. 6k^3 - k + 10k
B. -6k^4 - 12k^3 + 21k^2**
C. k^4 - k^3 + 10k^2
D. 6k^4 - 12k^3 + 10k^2

20. (-4x) X 9x^2
A. -36x^3**
B. -36x^2
C. 5x^3
D. 5x^2

21. (6y^2 - 4y) + (7y^2 - 7y)
A. 13y^2 - 11y**
B. -y^2 + 3^y
C. y^2 - 3y
D. 42y^2 - 11y

Thank you to everyone and anyone who helps ❤❤ \(￣︶￣*\))
(Also if someone could help me with #7 I would really appreciate that ❤)

- ❤~Mochi~❤